Method for detecting lidocaine content in lidocaine gel plaster
A lidocaine gel paste, detection method technology, applied in the directions of measuring devices, instruments, scientific instruments, etc., can solve the problems of low separation degree of detection method, hard paste, inability to accurately measure lidocaine content, etc. The effect of high sensitivity, improved stability and strong specificity
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[0034] High performance liquid chromatography conditions:
[0035] Instrument: High Performance Liquid Chromatography, Detector: UV Detector (VWD).
[0036]The chromatographic column is filled with octadecylsilane bonded silica gel column, the model is Inertsustion C18 (250×4.6mm, 5μm), and the mobile phase A and mobile phase B are used as the mixed mobile phase for isocratic elution. Among them, the mobile phase A It is 3% glacial acetic acid aqueous solution, its pH value is adjusted to 5.5 with 4mol / L sodium hydroxide solution, mobile phase B is methanol, and the volume ratio of mobile phase A and mobile phase B in the mixed mobile phase is 35:65. Detection wavelength: 230nm; flow rate: 1.0ml / min; injection volume: 20μl; column temperature: 25°C.
[0037] The preparation of need testing solution comprises the following steps: take this product (lidocaine gel plaster) 1 paste, remove cover liner, cut into pieces with scissors after folding, put in mortar, add 100ml methanol...
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